HTML Entity for Sine Wave (∿)

Beginner

5 min read

Updated: Sep 2026

1 example

Unicode U+223F

HTML Entity for Sine Wave (U+223F) tutorial illustration

Definition

What Is the Sine Wave Entity?

Sine Wave (∿) is the Mathematical Operators character at Unicode U+223F (SINE WAVE). HTML5 names it &acd;. Use it for trigonometry, waveforms, and signal-processing notation.

Remember

Character     ∿
Unicode       U+223F
Named entity  &acd;
Hex entity    &#x223F;
Decimal       &#8767;
CSS escape    \223F
Not the same  &sim; (∼ tilde operator)

Named, hex, decimal, CSS, and a typed character all produce the same glyph: ∿. Prefer &acd; in HTML markup. Do not confuse it with Tilde (&sim;, U+223C).

Reference

Quick Reference

One table for every form you will actually use.

Form	Code	Where it goes
Named entity	`&acd;`	HTML markup (best default)
Hex entity	`∿`	HTML markup
Decimal entity	`∿`	HTML markup
CSS escape	`\223F`	Stylesheet `content`
Direct character	`∿`	UTF-8 HTML text

When to Use Which

Situation	Use
Sine wave / waveform label	`&acd;` (preferred)
Numeric-only markup	`∿` or `∿`
Generated text via `::before` / `::after`	`content: "\223F"`
Tilde / similarity operator	Use &sim; (U+223C)
Greek capital sigma	Use Σ (U+03A3)

See it

Live Preview

Sine Wave in trig and signal contexts, compared with the tilde operator.

Trigonometry f(x) ∿ sin(x)

Large glyph ∿

Named entity &acd; → ∿

vs tilde operator ∿ | ∼

With entities Named: ∿ | Hex: ∿ | Decimal: ∿

Code

Complete HTML Example

One page that shows Sine Wave with named, hex, decimal, CSS escape, and a typed character. Use View Output or open the live editor.

Named + Hex + Decimal + CSS + Typed

Five ways to display ∿ in HTML and CSS.

html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Sine Wave (∿)</title>
  <style>
    #point::after {
      content: "\223F";
    }
  </style>
</head>
<body>
  <p>Built with Named: &acd;</p>
  <p>Built with Hex: &#x223F;</p>
  <p>Built with Decimal: &#8767;</p>
  <p id="point">Built with CSS: </p>
  <p>Typed: ∿</p>
  <p>Trig: f(x) &acd; sin(x)</p>
</body>
</html>

Try It Yourself

How It Works

1. Named: &acd; is the preferred HTML5 name for U+223F → ∿.

2. Hex: ∿ inserts the same code point. Same visual as named.

3. Decimal: same code point as 8767 → ∿.

4. CSS: use \223F in content (not an HTML entity). #point::after appends ∿.

5. Typed: paste ∿ in a UTF-8 document, or write labels like f(x) &acd; sin(x).

Pitfalls & Tips

Common mistakes when working with Sine Wave.

Named

Prefer `&acd;`

&acd; is the clear HTML5 named form. It is case-sensitive — write &acd;, not &ACD;.

Look-alikes

∿ ≠ ∼

U+223F is sine wave. U+223C is the tilde operator (&sim;) — do not swap them in math text.

A11y

Add context

A lone ∿ may be unclear. Pair it with text such as “sine wave” or “AC waveform” for screen readers.

CSS vs HTML

Do not mix escapes

\223F belongs in CSS. &acd; / ∿ / ∿ belong in HTML.

Semicolon

End references

Always finish with ; — write &acd;, not &acd.

Fonts

Glyph coverage

Mathematical Operators coverage varies. Test waveform labels on mobile and provide a fallback if ∿ is missing.

Compatibility

Browser Support

Sine Wave (U+223F) and its entity forms (&acd;, ∿, ∿, CSS \\223F) are supported in all modern browsers. Glyph coverage depends on the font.

✓ Universal encoding

Sine Wave (∿)

Encode with named, hex, decimal, or CSS escape — or type ∿ directly in UTF-8 HTML. Prefer &acd;.

100% Browser coverage

Google Chrome Supported

Yes

Microsoft Edge Supported

Yes

Mozilla Firefox Supported

Yes

Apple Safari Supported

Yes

Opera Supported

Yes

Internet Explorer IE 9+

Yes*

U+223F Full support

Bottom line: Prefer &acd; for readable HTML. Use \\223F only inside CSS content. Do not confuse with &sim;.

Remember

Key Takeaways

Unicode: this symbol is U+223F (decimal 8767) — sine wave.
HTML: prefer &acd; — or use ∿ / ∿.
CSS: use \223F inside content for generated waveform markers.
Watch out: not the same as tilde operator (&sim;, U+223C).

One line: U+223F → &acd; / ∿ / ∿ / CSS \223F.

Frequently Asked Questions

How do I display Sine Wave (∿) in HTML using entities?

Use &acd; (named), ∿ (hex), ∿ (decimal), or the CSS escape \223F in the content property. All render ∿. Prefer &acd; for readable markup.

What is the Unicode value for Sine Wave?

U+223F (SINE WAVE). Hex 223F, decimal 8767, named entity &acd;. It belongs to Mathematical Operators (U+2200–U+22FF).

Is there a named HTML entity for U+223F?

Yes. HTML5 defines &acd; for U+223F. It is case-sensitive — write &acd;, not &ACD;.

When should I use this HTML entity?

Use it for trigonometry, signal-processing labels, AC waveform notation, and math content that needs a sine-wave glyph. Prefer &acd; in source for clarity.

How is U+223F different from U+223C?

U+223F is SINE WAVE (&acd;). U+223C is TILDE OPERATOR (&sim;). Related wavy math symbols, different characters and meanings.

What is the difference between HTML code and CSS entity for U+223F?

HTML entities (&acd;, ∿, or ∿) go in markup. The CSS escape \223F is used in stylesheets (usually in the content property of ::before/::after). Both render ∿.

Did you know?

Sine Wave is Unicode U+223F (decimal 8767) — glyph ∿ (SINE WAVE) in Mathematical Operators. HTML5 names it &acd; (case-sensitive). Prefer it for trigonometry and waveform notation. Do not confuse it with the tilde operator (&sim;, U+223C).

Next: Single High Reversed 9 Quotation Mark

Learn the HTML entity for Single High Reversed 9 Quotation Mark — next in this sequence.

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About the author

Mari Selvan M P 🔗

Developer, cloud engineer, and technical writer

Experience 12 years building web and cloud systems
Focus Full Stack Development, AWS, and Developer Education

I write practical tutorials so students and working developers can learn by doing—from databases and APIs to deployment on AWS.

AWS Certified Developer – Associate (Credly)

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HTML Entity | Sigma HTML Entity | Single High Reversed 9 Quotation Mark